spec: Automatically turn on cgconfig service

A number of the libvirt APIs require the use of cgroups. This is not
enabled by default on a RHEL6 install. After discussion with cgroups
team, it was decided that upon installation of the libvirt RPM, we
should automatically turn on the cgroups service. This will activate a
default configuration that turns on all cgroups controllers libvirt
requires for full operation.

libvirt.spec.in

@@ -68,6 +68,7 @@
 %define with_libnl         0%{!?_without_libnl:0}
 %define with_audit         0%{!?_without_audit:0}
 %define with_dtrace        0%{!?_without_dtrace:0}
+%define with_cgconfig      0%{!?_without_cgconfig:0}
 
 # Non-server/HV driver defaults which are always enabled
 %define with_python        0%{!?_without_python:1}
@@ -169,6 +170,13 @@
 %define with_dtrace 1
 %endif
 
+# Pull in cgroups config system
+%if 0%{?fedora} >= 12 || 0%{?rhel} >= 6
+%if %{with_qemu} || %{with_lxc}
+%define with_cgconfig 0%{!?_without_cgconfig:1}
+%endif
+%endif
+
 # Force QEMU to run as non-root
 %if 0%{?fedora} >= 12 || 0%{?rhel} >= 6
 %define qemu_user  qemu
@@ -271,6 +279,9 @@ Requires: parted
 # For multipath support
 Requires: device-mapper
 %endif
+%if %{with_cgconfig}
+Requires: libcgroup
+%endif
 %if %{with_xen}
 BuildRequires: xen-devel
 %endif
@@ -725,6 +736,12 @@ then
 fi
 %endif
 
+%if %{with_cgconfig}
+if [ "$1" -eq "1" ]; then
+/sbin/chkconfig cgconfig on
+fi
+%endif
+
 /sbin/chkconfig --add libvirtd
 if [ "$1" -ge "1" ]; then
 	/sbin/service libvirtd condrestart > /dev/null 2>&1